The calculated distance (air line) between Zürich (Kreis 9) / Altstetten and Kriens is approximately 26 miles respectively 43 kilometers.
By car or train, the actual journey to Kriens is certainly longer, as only the direct route (as the crow flies) between Zürich (Kreis 9) / Altstetten and Kriens has been calculated here.
Air line (approximately)
43 kilometers
23 nautical miles